| Index | Decatur | Nebraska | National |
| Average Test Scores | n/a | 53% | 48% |
| Student/Teacher ratio | n/a | 13:1 | 16:1 |
| Total public schools | n/a | 780 | 79,221 |
| Total private schools | n/a | 182 | 24,874 |
| Total post-secondary schools | n/a | 56 | 7,963 |
| Index | Decatur | Nebraska | National |
| Completed 8th grade | 80.1% | 88.4% | 84.3% |
| Completed high school | 78.6% | 87.2% | 83.0% |
| Completed some college | 42.2% | 63.7% | 59.4% |
| Completed associate degree | 17.4% | 40.1% | 38.5% |
| Completed bachelors | 7.8% | 30.0% | 30.3% |
| Completed masters | 3.7% | 9.9% | 11.5% |
| Completed professional degree | 0.6% | 2.9% | 3.3% |
| Completed doctorate | 0.0% | 1.2% | 1.3% |
There are a total of n/a public schools, n/a private schools and n/a post-secondary schools in Decatur. Using the proficiency score averages, the average test scores for Decatur, NE schools is n/a. The average student to teacher ratio is n/a. In Decatur, NE, an average of 80.1% of students have completed 8th grade and an average of 78.6% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Whiting, IA | 829 | 68% | 40.6% |
| Onawa, IA | 2,788 | 66% | 36.5% |
| Oakland, NE | 1,575 | 60% | 24.0% |
| Lyons, NE | 766 | 55% | 13.5% |
| Walthill, NE | 923 | 15% | 69.3% |
| Decatur, NE | 402 | n/a |
| City | Population | Avg. Test Scores | National Avg. |
| Osborn, MO | 402 | 50% | 4.2% |
| Corning, OH | 402 | 54% | 11.5% |
| Harrod, OH | 402 | 73% | 52.8% |
| Earlsboro, OK | 402 | 19% | 60.9% |
| Powers, MI | 401 | 55% | 14.1% |
| Decatur, NE | 402 | n/a |
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